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procedure TForm1.Button1Click(Sender: TObject);
var
  h: hwnd;
begin
  h := FindWindowByTitle('notepad');
  if h <> 0 then // if we found notepad
    CloseWindow(h)
  else
    ShowMessage('not found.');
end;					

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function FindWindowByTitle(WindowTitle: string): Hwnd;
var
  NextHandle: Hwnd;
  NextTitle: array[0..260] of char;
begin
  // Get the first window
  NextHandle := GetWindow(Application.Handle, GW_HWNDFIRST);
  while NextHandle > 0 do
  begin
    // retrieve its text
    GetWindowText(NextHandle, NextTitle, 255);
    if Pos(WindowTitle, StrPas(NextTitle)) <> 0 then
    begin
      Result := NextHandle;
      Exit;
    end
    else
      // Get the next window
      NextHandle := GetWindow(NextHandle, GW_HWNDNEXT);
  end;
  Result := 0;
end;					

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ShellExecute(Application.Handle, 'CLOSE' ,PChar(optionen.botexe.text), nil, PChar(optionen.botfolder.Text), sw_ShowMaximized);					

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var
  hWnd: THandle;
begin
  hWnd := FindWindow(nil, 'Rechner');
  if hWnd <> 0 then
    SendMessage(hWnd, WM_CLOSE, 0, 0)
  else
    RaiseLastOSError();